Water tube boiler



Aug. 15, 1933. J. KEMNAL WATER TUBE BOILER Original Filed Aug. 2, 1927 4 Sheets-Sheet 1 fid- M fin mnS mf mww $51 M. M e c Thflnc 0 Di m if M E W .avzfipm 2 M ATTORNEY I 4 Sheets-Sheet 2 limia L Gm 067/,

J. KEMNAL WATER TUBE BOILER Original Filed Aug. 2, 1927 -nuacoouonuupnooouoooo lnolboeofloooonouoooooou II.OQOOCIIOIIOOOODOOOOBcOoooo Aug. 15, 1933.

Aug. 15, 1933. KEMNAL 1,922,663

WATER TUBE BOILER Aug. 2, 1927 4 Sheets-Sheet '3 frecufors.

1 ATTORNEY Aug. 15, 1933. KEMNAL 1,922,663

WATER TUBE BOILER v Fil Ori' ug. 2, 1927 4 Sheets-Sheet 4 Fig/t a a a u o o o o o a n u e 0o II? oer/#011 Jbmas Karma; 0 ecea5ea4 I3 L/ho/a L. Kern/70A Hora e Q5/2796,

7 ATTORNEY lation system of the boiler.

Patented Aug. 15, 1933 more!) STATES WATER TUBE BOILER James Kemnal, deceased, late of Chislehurst,

England, by Linda Larita Kemnal, Chislehurst, Horace James and Boy James Giinn,

Blackheath, London,

and Archibald Hall- Brown, Purley, England, Executors, assignors to The Babcoek & Wilcox Company, Bayonne, N. 3., a Corporation of New Jersey Application August 2, 1927, Serial No. 210,126, and in Great Britain August 9, 1925. Renewed November 9, 1931 10 Claims.

This invention relates to a water tube boiler composed of two interconnected units located above a furnace having water tubes in the walls thereof, which tubes are connected to the circu- The invention will be understood from the description in connection with the accompanying drawings, in which Fig. 1 is a vertical section through an illustrative embodiment of the invention; Fig. 2 is a half section along the line 2-2 of Fig. i; Fig. 3 is a vertical section through a modification, and Fig. 4 is a half section along the line 4-4 of Fig. 3.

In the drawings, reference character 5 indicates the furnace above which are located the two boiler units that are interconnected. Each unit comprises a bank of inclined tubes 6 connected to downtake headers l and uptake headers 8, and having baffies 9 for directing the gases over the tubes, as is well known in boilers of the Babcock and Wilcox type. Nipples 10 lead from the water space of the steam and water drum 12 to the downtake headers 7 and horizontal circulators 11 lead from the upper ends of the uptake headers 8 to. the steam and water drum 12.

Each unit of the boiler also comprises a bank of inclined tubes 15 spaced from the bank 6 and connected to downtake headers 16 and uptake headers 1'7. The upper ends of the downtake headers 16 are connected to the lower ends of the downtake headers 7 by long nipples 18, and the upper ends of the uptake headers 17 are connected to the lower ends of the uptake headers 8 by long nipples 19. Suitable closure means are provided for the spaces between the nipples l0, l8 and 19 to define the walls of the gas passages. Each unit also comprises a row of tubes 20 extending from the lower ends of the downtake headers 16 of one unit to the lower ends of the uptake headers 17 of the other unit. The tubes of the rows 20 cross each other at 21 below the space that is left between the units in such a manner that the tubes of one row 20 alternate with the tubes of the other row where they cross each other. The space between the units is large enough to permit access to the fittings. The tubes 20 are lined with brick or tile 22 so as to close the lower end of the space between the boiler units. The nipples 19 are also lined with tile between the headers 8 and 17.

Tubes 25 extend from the steam space of both drums 12 to a central steam drum 26 from which tubes 27 extend on each side to the inlet headers of superheaters 28 that are located between the banks of tubes 6 and 15. The superheater tubes are U-shaped and the leg portions thereof are preferably inclined so as to be allel with the tubes 15. Connections 29 lead from the outlet headers of the superheaters to the steam main. The superheater headers are preferably located outside of the boiler setting. Reheater tubes 30 are also located in the spaces between the banks of tubes 6 and 15, and extend transverse to these tubes. The reheater tubes may be connected to headers 301 on the outside of the boiler setting.

Tubes 35 lead from the water spaces of the steam and water drums 12 on each side of the boiler and are provided with branches 37 and 38 that are connected to headers 39 and 40 on the outside of the lower portion of the furnace 5. Water wall tubes 41 lead from the headers 39 at the front and rear of the boiler to upper headers 42 near the upper outside portion of the furnace 5. Tubes 43 lead from the headers 40 to the headers 44 and 45. Tubes 4-5 lead along the side Walls of the furnace from the headers 44 to the headers 47. Tubes 56 lead from the tubes 35 to the headers 51 on each side, from which headers rows of tubes 52 lead along the inclined roof portion of the furnace on each side to headers 53, and tubes 54 connect the headers 4'7 and 53. Tubes 55 lead from the headers 42, tubes 56 lead from the header 45 at each end and tubes 57 lead from the headers 53, the tubes 55 connecting to the tubes 56 and the tubes 56 and 5'? connecting to unions 58 from'which unions tubes 59 lead on each side to headers 60 that are in turn connected by nipples 61 to the steam spaces of the steam and water drums 12.

Fuel burners 63 are mounted on opposite walls of the furnace, and girders6=l at the top of the boiler support the drums 12 and headers 8 by means of straps 65. The air heaters 66 are also supported on the girders 64, these air heaters being located above the waste gas outlets 67. The tubes 46 of the furnace walls pass alternately between the tubes 52 of the furnace roof, thereby providing a construction which is advantageous in keeping the header boxes for the tubes outside of the heated zone, and making a gas tight joint where the roof of the furnace joins the wall of the furnace. This arrangement also provides for a maximum cooling of the furnace wall at the point where the tops of the side walls join the roof of the furnace, which is advantageous in maintaining the brickwork or tile at this point, and preserving a gas tight seal; the side wall cooling tubes and the roof cooling tubes discharge into the same headers, so that the pressure in these tubes is equalized; a space for accessibility is provided between the units of the boiler and the portion of the furnace roof that comes below this space is formed by means of tile placed on water cooling tubes, with the tubes coming side by side from two directions and passing each other as they alternate; a sufficient steam equalization is preferably provided between the drums 12 by means of the tubes 25 and drum 26 to avoid forcing all the water from one unit of the boiler to the other because of higher ressure that might otherwise be developed in one unit than in the other.

In the modification shown in Figs, 3 and 4, the same parts are designated by the same ref erence characters, and it will be unnecessary to describe these parts again. In this modification, there are a plurality of steam equalizing pipes 25 leading from the steam space of each drum 12 to the steam drum 26. Also in this modification, the reheaters 30' are made up of headers and U-shaped tubes similar to the headers and U-shaped tubes of the superheaters 28 and are parallel thereto. In this modification, burners 63 are shown of a somewhat different type from the burners 63 of the other illustration of the invention.

In the modification shown in Figs. 3 and 4, tubes '70 lead from the water spaces of the drums 12 to unions 71 at the front and rear of the boiler, from which unions tubes '72 lead to headers 73 located outside of the furnace near the lower portion thereof. Water wall tul cs '75 lead from the eaders '73 along the inside walls of the furnace to outside headers 76 located near 1e upper end of the furnace, and tubes 77 lead from the headers '76 and are connected to the steam spaces of the steam and water drums 12.

Branches of tubes 72 lead into opposite ends of the header '74 located below the central portion of the furnace 5. Slag screen tubes '79 extend across the lower portion of the furnace 5 through the walls into headers 80 on the outside of the furnace and near the bottom portion thereof. Tubes 81 lead from the headers 80 to the steam and water spaces of the drums 12. In this modification a conduit 82 is illustrated above the air heaters 66 and leads to a suction fan 83 located in the stack.

What is claimed to be new and is desired to be secured by Letters Patent is:

1. In a steam boiler, a furnace, banks of inclined tubes of said boiler at substantially the same level located above said furnace, said banks being spaced apart lengthwise of said tubes to provide an access space, upright headers to which the ends of said tubes are connected, said headers being supported from above, rows of tubes extending along the roof of said furnace below said banks of tubes, tubes of said rows extending below said access space and being lined to close the lower end of said space.

2. In a steam boiler, a coal burning furnace, banks of inclined tubes of said boiler at substantially the same level located above said furnace, said banks being spaced apart lengthwise of said tubes to provide an access space, upright headers to which the ends of said tubes are connected, said headers being supported from above, rows of tubes extending along the roof of said furnace below said banks of tubes, tubes of said rows crossing each other below said access space,

being lined to close the lower end of said space and forming slag screen tubes for said banks of inclined tubes.

3. In a steam boiler, a coal burning furnace, banks of inclined tubes of said boiler at substantially the same level located above said furnace, said banks being spaced apart lengthwise of said tubes to provide an access space, upright headers to which the ends of said tubes are connected, said headers being supported from above, rows, of tubes extending along the roof of said furnace below said banks of tubes, tubes of said rows crossing each other below said access space, being lined to close the lower end of said space, and water tubes along the walls of said furnace connected to the water circulation system of said boiler.

i. In a steam boiler, a furnace, banks of inclined tubes of said boiler at substantially the same level located above said furnace, said banks being spaced apart lengthwise of said tubes to provide an access space, upright upper and lower headers to which the ends of said tubes are connected, said upper headers being located near the middle line of the roof of said furnace and spaced apart to form an access space and being supported from above, means to protect the lower ends of said upper headers from excess heat, said means comprising tubes connected to said headers and crossing each other below said access space.

5. In a twin steam boiler comprising two units each having a of downtake headers and a set of uptake hea s, the sets of uptake headers being eubstani 'y parallel to each other and spaced apart, bani of tubes connecting the headers of the respective boiler units, other tubes communicating with the downtake headers of one of the units and extending beneath the uptake headers of this unit into the uptake headers of the other unit, and a roof bafile closing the lower end of the space between said uptake headers and supported by said other tubes.

6. In a steam boiler, a furnace, banks of inclined tubes of said boiler at substantially the same level located above said furnace, said banks being spaced apart lengthwise of said tubes to provide an access space, upright headers to which the ends of said tubes are connected, rows of tubes extending along the roof of said furnace below said banks of tubes with tubes of said rows extending below said access space and being lined to close the lower end of said space.

7. In a steam boiler, a furnace, banks of inclined tubes of said boiler at substantially the same level located above said furnace, said banks being spaced apart lengthwise of said tubes to provide an access space, upright headers to which the ends of said tubes are connected, the lower ends of some of said headers extending outside of the walls of said furnace, rows of tubes extending along the roof of said furnace below said banks of tubes with tubes of said rows extending below said access space and being lined to close the lower end of said space.

8(In a steam boiler, a furance, banks of inclined tubes of said boiler located above said furnace at substantially the same level, said banks being spaced apart lengthwise of said tubes to provide an access space, upright headers to which the ends of said tubes are connected, rows of tubes extending along the roof of said furnace below said banks of tubes with the ends of tubes in one of said last-named rows overlapping those in another one of said last named rows; and means associated with the overlapping portions of said last-named tubes to shield the lower ends of some of saidheaders from the heat of the furnace.

9. In a steam boiler, a furnace, banks of inclined tubes of said boiler located above said furnace at substantially the same level, said banks being spaced apart lengthwise of said tubes to provide an access space, upright headers to which the ends of said tubes are connected, rows of tubes extending along the roof of said furnace below the headers adjacent said access space, and means associated with said lastnamed tubes to close the spaces betwee adjacent tubes in each of said rows below and between headers adjacent said access space whereby the lower ends of some of said headers are shielded from the heat of the furnace and a closure is provided for the lower end of said access space.

10. In a steam boiler, a furnace, banks of inclined tubes of said boiler located above said furnace at substantially the same level, said banks being spaced apart lengthwise of said tubes to provide an access space, upright headers to which the ends of said tubes are connected, rows of tubes extending along the roof of said furnace below said banks of tubes with tubes of said rows extending below said access space, and means associated with said last named tubes to close the lower end of said space and to shield the lower ends of some of said headers from the heat of the furnace.

LINDA LARITA KEMNAL,

HORACE JAMES,

ROY JAMES GLINN,

ARCHIBALD HALL-BROWN, Executor-s of the Estate of James Kemnal, De-

ceased. 

